Ken,
Very late in the production of the 3 rail transmissions, there were a few that 
actually were fitted with J type overdrives.  I have a
friend in Washington that has some of the special shafts that are required to 
mount the J type on the 3 rail.
So, to answer your question, they are not "exactly" interchangeable, but with 
the right combination of parts, anything is possible.
Joe
P.S. Got your envelope today!  Thanks!
Ken C wrote:
> 
> Spitsters,
> 
> Certainly this topic has been covered before, of course I wasn't
> listening...
> 
> Are the 3-rail trans / D-type overdrive assembly and the single-rail trans /
> J-type od assembly physically interchangeable ? In other words, if one
> assembly is removed from the car, can the other be installed in place ?
> 
> TIA... Ken C
 
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